Originally posted by Tony2005:
Originally posted by Nathan:
Started out as engine stumbling under heavy load (WOT) at lower RPMS, such as going up hills. Just yesterday it started running like this all the time, regardless of load or RPMs.

No CEL. Got fairly new plugs, fuel & air filters (stock). After searching the forums I tried disconnecting the MAF - didn't help. ...Secondaries are opening alright.





Clean IAC, MAF. Check battery, alternator, O2 sensor, spark plug wires, fuel pump, vacuum leaks.

Edit. And scan for CELs eventhough it is not lighted. And how "new" are the plugs, air and fuel filters? Also test for plugged exhaust by removing O2 sensor.



Thanks for the suggestions. After inspecting the wires I found a cracked boot. The wires were original with 200k (kilometers) on them. I replaced them (Motorcraft) and it sure runs well now - MUCH more torque.

I checked CELs - no codes. Plugs & fuel filter are a couple months. Air filter is a year.

P.S. Based on a post here I gapped the plugs down to .44 from .56 (prior to discovering the wire were bad. Should I put them back to .56? Would I see any difference in performance?

************************ '95 Contour SE V6-MTX.